Cutting mechanism for automatic looms



April 24, 1928. 1,667,261 I u D. LEMIEUX CUTTING MECHANISM FOR AUTOMATIC LOOMS Filed Jan. 25. 1927 2 Sheets-Sheet 1 INVENTOR.

ATTORNEY.

April 24, 1928.

D. LEMIEUX CUTTING MECHANISM FOR AUTOMATIC LOOMS 2 Sheets Sheet 2 Filed Jan. 25, 1927 A TTORNEY.

Patented Apr. 24, 1928.

-UNITED STATES DAVID LEMIEUX, OF LEWISTON, MAINE.

the selvage each time the loom doffs.

v 1,667,261 PATENT OFFICE.

CUTTING MECEANISM FOR AUTOMATIC LOOMS.

Application filed January 25, 1927. Serial No. 163,456.

of the device to thevloom in such a manner that it will operate to simultaneously pull or hold thefilling and cut the same close to As understood inthe art, the doffing process takes place automatically when the loom ,.changes shuttle.

As is well understood in the art, in the v ordinary operation of a cotton goods manufacturing plant, it is necessary to employ at least one operative to each loom to go over all of the cloth, inspeeting same and picking out knots, burrs, loose threads, etc., every foot or so in the material. This operationis known as hurling, and is performed by the cloth room help. By reason of this invention, however, the necessity for hurling is reduced to a. minimum, if not indeed entirely eliminated by reason of the fact that the filling or thread being cut close to the selvage is not pulled back into the filling to make a homely and irregular thread i n the cloth. A further object of the invention is to I provide an attachment of the character described which embodies substantially few working partsof simple and practical construction and which can be readily adjusted. to fit the loom with little or no alteration of.

, the latter.

Additional objects will be apparent from i i the following description of the device and from [the accompanying drawings, wherein: Figure 1 is an elevational view of the attachment as seen from one side thereof.

' Figure 2 is'a similar view as seen from the opposite side.

Figure 3 is a cross section view on line 33 of Figure 2.

Figure 4 is a fragmentary plan view of the attachment illustrating the jaw-face construction.

Figure 5 is an elevational view illustrating the attachment in play on a loom.

Figure 6 is a diagrammatic view of the parts shown in Figure 5.

' Figure 7' is a detail view of one of the jaw members of the attachment. I

knife in shear is composed of the ing the upper jaw 2 with grooves 6, as

shown. The upper jaw 2 has a cutting or shearing edge 7 adapted to cooperate with a similar edge 8 on the blade 9. carried by the lower jaw 1. H Blade 9 extends just far enough above the gripping face of thelower jaw to enable the knife or shear to cut the thread and grip the loose end almost simultaneously. To allow for the convenient attachment thereto of the blade 9, the lower jaw may be provided, on its bottom side and co-extensive with one edge thereof, with a depending shoulder or extension 10 against the face of which the blade is held by the attaching screws 11 engaging the threaded openings 12 in the shoulder. The openings in the blade through which the attaching screws extend are not threaded and, hence, the blade is free to slide on the screws under certain conditions, as when the screws are loosened. As will be seen in Figure l,the

confronting faces of the blade 9 and the against the blade and seryeto keep the same tight against the heads of the attaching screws. Follower screws 15 are also threadedly engaged in the jaw shoulder 10, and have their ends receivable in suitable cavities or seats 16 formed in the blade. 9, as illustrated. A i v The jaws are normally retained inclosed position by means of a tensioning device which may consist of a helical spring 17 having one end attached to theupper jaw member at18 and having the other end attached to a part 19 mounted on the extension 20 of the lower jaw member which extension serves as a handle for attaching the device to the loom. The member is attached to the loom in such manner that the blade 9 runs along the selvageof the cloth being manufactured-and forthis urpose the end of the handle 20 is secured by the fasteners 21 to the breast beam 22 of the loom with the knife disposed rearwardly thereof and at right angles tothe LI! 12K reciprocating transfer arm 2'? of the loom.

Connected to this arm, as at 28, is a laterally extending rod 29 of irregular shape to fit the loom and provide at its outer extremity with a horizontally disposed pivotally mounted finger 30 adapted to strike against pin 31 on the upper jaw memberl The striker finger 80 is normally maintained in substantially horizontal position by a helical spring 82 and is limited inits upward moveinent'by the shoulder Inthe operation of the loom, when the transfer arm moves downwardly for the purpose of changing the bobbin in the shuttle-,the rod 29 moves down also and causes the finger 30 to strike and press down on the pin 3lwhich opens the jaws of the knife or shear. The finger 80 is so bevelled on the edge that it allows the pin to slip past after the jaws have been suiiiciently opened or separated and the tensioning spring 17 is then free to act for closing the jaws again.

By this arrangement the knife is able to catch the staple thread and to cut the same near the cotton, the felt and the grooves otthe jaws aiding them in gripping and holding the loose end of the filling. There will, therefore, be no staple thread. from the bobbin which may be woven into the filler and cause an irregularity.

From the foregoing description, the advantages of construction and the method of operation will he readily apparent to those skilled in the art to which the invention relates, and it is to be understood that th'edevice shown is merely illustrative and that suclrchanges may be made, when desired, as are within the scope or" the appended claims. i Having thus described the invention, what is claimed is:

'1. A. cutter attachment for a loom comprising a pair of relatively pivoted members having counting jaws and cutters, one of said members having an extension serving as a handle for attaching the device to the loom, jaw tensioning means normally holding the jaws and cutter in closed position, a

projecting pin on one of said jaws, an operating rod, a pivoted finger carried by the rod and projecting over the said pin to press down ,on the latter for opening the jaws and cutters when the said rod ismo'ved downwardly, said finger being tree to swing downwardly from the horizontal but rebiIllCl'Gtl from any upward movement above the horizontal, said linger being beveled to.

.a. A cutting mechanism for automatic looms comprising a stationary knife having one end lined to the breast beam of the loom and its other end disposed towards the lay of the loom and termed to present a flat clamping jaw having a cutting edge, a movable knife pivoted to the stationary knife and also formed to present a flat clamping jaw having a cutting edge, said pivoted cutter having an abutment thereon, tensioning means norn'ially holding m: jaws closed, for mechanism, and an operating mom-- depending from the reciprocating arm of the transfer mechanism and adapted to strike the abutment of the said pivoted knife to move the latter into open position,'said abutment and said operating member hav presenting relatively npper and lower clamping surfaces, one of said cutters having a cutting edge and theother cutter having a depending shoulder, a knife secured to said shoulder, and thrust means between the said knite and thesaid shoulder.

i. A cutting mechanism for automatic looms comprising a pair of relatively plvotod cutters presenting relatively upper and lower clamping surfaces, one of said cutters having a cutting edge and the other cutter having a depending shoulder, a knife adjustably secured to said shoulder, and tensioning means between the said knife and the shoulder for exerting outward thrust against the said knife.

5. It cutting mechanism for automatic looms comprising a cutter. fixed to a stationary part of the loom and presenting a flat clan'iping having a cuttingedge, a cuttor pivoted to the fixed cutter and having a clamping jaw adapted to co-act with the clamping jaw of the fixed cutter to clamp the filling thread. therebetween a transfer mechimisu'i, an operating rod carried by the reciprocating arn'iot' the transfer mechanism for movement laterally of the said pivoted cutter, said pivoted cutter having an abutmentthereon, and a lateral prbjeotion on said rod adapted to strike and press down on the abutment when the rod descends for opcning'the cutter, said projection being pivotally mounted to move freely out ot the path of the abutment when the said rods ascends. i

looms comprisinga air of relatively pivoted cutters presenting at contacting clamping jaiws, one of said cuttersbeing provided along one edge of the jaw with a cutting edge, the other cutter having a depending shoulder, supporting screws threadedly engaged in said shoulder, a cut-ting blade sugported on said screws, said blade and sai shoulder having relatively ali ned recesses co-acting to provide spring poc ets, and springs with- 10 In testimony whereof I hereunto aflix my signature.

DAVID LEMIEUX. 

